When pH levels in the blood get too low,
chemical buffers are released that return blood
pH back to normal levels. This is an example
of ___.
a. negative feedback
b. positive feedback
c. constancy
d. sensory perception
e. endothermal reactions
A
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Which tissue gives rise to secondary xylem and phloem?
a. protoderm b. apical meristem c. ground meristem d. vascular cambium
e. procambiumIf a child belonged to blood type O, he or she could
NOT have been produced by which set of parents? a. type A mother and type B father b. type A mother and type O father c. type AB mother and type O father d. type O mother and type O father e. type O mother and type B father
Which stage of translation is shown here?
a. initiation b. elongation c. termination d. peptide bond formation e. polysome activity
Which of the following is NOT a step that ultimately leads to antibody production?
a. Activation of helper T cells by dendritic cells b. Differentiation of plasma cells c. Activation of cytotoxic T cells by helper T cells d. Immature B cells conducting surveillance for foreign epitopes